Hub member for swivel chairs



M. Fox HUB MEMBER FOR SWIVEL CHAIRS n March 15, 1949.

Filed Deo. 12, 194e Patented Mar. '15, 1949 HUB MEMBER FOR SWIVEL CHAIRS Martin Fox, Chicago, Ill., assigner to The Seng Company, a corporation of Illinois Application December 12, 1946, Serial No. 715,699

2 Claims.

This invention relates to hub members for swivel chairs.

The principal object of the invention is to provide a hub member which is formed of simple stamped and machined pieces, rather than castings.

A further object is to provide such a hub member which can be substituted for the conventional cast hub member without changing the design of a chair base.

A further object is to provide a hub member which is lighter and stronger than cast hub members, and one which is assembled in an inexpensive and easy manner.

The invention is illustrated in a preferred em'- bodiment in the drawings, in which:

Fig. 1 is an elevational View of a swivel chair; Fig. 2 is a fragmentary sectional View taken as indicated at line 2-2 of Fig. 1; Fig. 3 is an eX- ploded perspective view of the hub member; and Fig. 4 is a vertical central section thereof.

In the embodiment illustrated, a swivel chair has a base 5 provided with legs 6 which are secured together at their lower inner ends by means of a bottom plate 1. The legs are shown provided with conventional casters 8. A tilting chair 9, having an adjustable back l0, is carried by a head-member I I secured to the top of a threaded spindle I2. The spindle ts into a hub member, which is the subject matter of the present invention and is mounted in and secured to the hollow base 5.

As best shown in Figs. 3 and 4, the hub assembly has a tubular portion I3, preferably formed of pipe, with its ends turned down to a reduced diameter to provide a bottom shoulder I4 and a top shoulder I5. A collar-member I6 has a flanged end I'l, which ts snugly over the reduced portion of the lower end of the tube I3 and is held against the shoulder I4 by outward flaring of the tube, as indicated at I8.

The upper collar I9 is similar to the lower collar and has a anged end which abuts against the upper shoulder I5. A top bearing plate has a hollow central portion which is loosely impaled by the upper end of the tube and rests on the top of the collar I9. The plate is shown with openings 2l to receive wood screws 22, which engage the top-s of the legs of the base.

A grooved ring 23 is also fitted over the upper end portion of the tube, and the upper assembly is secured together by aring the upper end of the tube, as indicated at 24, into a chamber 25.

A top cap 2B has a central aperture which fits loosely around the spindle I2 and rests on a nut 2l which is threaded to the spindle. The nut has a downwardly extending arm 28, which is drilled and tapped to receive a machine screw 29, which extends loosely through an aperture in the cap 2li and projects into the groove in the ring 23, so as to prevent the chair and post from being accidentally lifted oi from the base 5.

If it is desired to remove the chair and spindle, it is merely necessary to unscrew the machine screw 29 so as to disengage it from the ring 23. It will be understood that the height of the chair may be adjusted by rotating the cap member and nut with respect to the spindle I2. However, in normal operation, the spindle, cap and nut turn together with respect to the ring member 23, so that the vertical adjustment is not changed.

The foregoing detailed description has been given for clearness of understanding only, and no unnecessary limitations should be understood therefrom, for some modifications will be obvious to those skilled in the art.

I claim:

1. A hub member for a swivel chair comprising: a tube adapted to receive the threaded spindle of a chair, said tube being provided with upper and lower external abutment shoulders spaced from its ends; a lower collar member on the lower end of the tube having a flanged end abutting against said lower shoulder and gripped thereon by outward flaring of the lower end of said tube; an upper collar member on the upper end of the tube and having a flanged end abutting against said upper shoulder; a top bearing plate impaled by said tube and -resting on said upper collar, said plate being adapted to be secured to a chair base; and a grooved ring surmounting said plate and upper collar-on the tube and permanently secured thereto by outward flaring of the top of said tube into a chamber in said grooved ring.

2. A hub member for a swivel chair comprising: a tube having end portions turned down to a reduced diameter to afford upper and lower abutment shoulders; a lower collar member on the lower end of the tube having a iianged end abutting against said lower shoulder and gripped thereon by outward aring of the lower end of said tube; an upper collar member on the upper end of the tube and having a ilanged end abutting against said upper shoulder; a top bearing plate impaled by said tube and resting on said upper collar, said plate being adapted to be secured to a chair base; a grooved ring surmounting said plate and upper collar on the tube and permanently secured thereto by outward flaring of the top of said tube into a. chamfer in said grooved REFERENCES CITED ring; a, spindle nut resting on the grooved ring,

said nut being provided with a downwardly ex- The following references are of record in the tending arm which has an aperture threaded file 0f thS Patenti to receiye a set screw; a top -cap on said spindle 5 UNITED STATESl PATENTS nut, sald top cap having an aperture Whlch registers with the aperture in said arm; and a Number Name Darte Iehredded Chair spindle screwed through said 1,416,693 Dawson May 23, 1922 spindle nut and extending inne seid1 tube, Said 1,485,910 Dawson Mar- 4. 1924 spindle having a. tilting chair supporting bracket l0 2.021,13?. T-.ffelty -e-L-1-..N0Y 19. 1935 at its upper end.

MARTIN FOX.

Certificate of Correction Patent No. 2,464,300. March 15, 1949.

MARTIN FOX It is hereby certified that errors appear in the printed specicetion of the above numbered patent requiring correction as follows:

Column 1, line 53, and column 2, line 39, claim 1, for the Word chamber read chamfer; and that the seid Letters Patent should be read With these corrections therein that the same may conform to the record of the case in the Patent Oflioe.

Signed and sealed this 23rd day of August, A. D. 1949.

THOMAS F. MURPHY,

Assistant ommssoner of Patents. 

